package com.itcam.reflection_;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;

/**
 * Author:Cammy.Wu
 * Date:2024-05-13
 * Description:分析性能问题
 */

// 普通方式调用
public class ReflectionDemo09 {

    public static void test01() {
        User user = new User();

        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 1000000000; i++) {
            user.getName();
        }

        long endTime = System.currentTimeMillis();

        System.out.println("普通方法执行10亿次：" + (endTime - startTime) + "ms");
    }

    // 反射方式调用
    public static void test02() throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
        User user = new User();
        Class c1 = user.getClass();

        Method getName = c1.getDeclaredMethod("getName", null);

        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 1000000000; i++) {
            getName.invoke(user,null);
        }

        long endTime = System.currentTimeMillis();

        System.out.println("反射方法执行10亿次：" + (endTime - startTime) + "ms");

    }

    // 反射方式调用 关闭检测
    public static void test03() throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
        User user = new User();
        Class c1 = user.getClass();

        Method getName = c1.getDeclaredMethod("getName", null);
        getName.setAccessible(true);

        long startTime = System.currentTimeMillis();

        for (int i = 0; i < 1000000000; i++) {
            getName.invoke(user,null);
        }

        long endTime = System.currentTimeMillis();

        System.out.println("反射方式 关闭检测 执行10亿次：" + (endTime - startTime) + "ms");
    }

    public static void main(String[] args) throws InvocationTargetException, IllegalAccessException, NoSuchMethodException {
        test01();
        test02();
        test03();
    }
}
